I had a project that used docuSign a few years ago. There were some very strange things going on with their API.
I remember having to call them asking where to find a template ID so I could save that and send out the proper doc to customers. It was not listed anywhere on the developer dashboard. The rep told me in a very condescending way that it template ID was part of the URL. I should have known to just use that!
My app was written in a python backend. They had a some API examples in different languages for their docs. The python example was a total embarrassment. It was clear that the person who wrote it had no experience with python at all. I am not trying to be mean, it was that bad. Every line ended with a semicolon (in python this is not an error, but is officially discouraged). The person also seemed to not be aware of a dictionary. They built their json paylod by concatenating text. It was the messiest python code I had ever seen. I think this particular bit of code is gone now, but it was incredible.
I felt so bad that I emailed them some suggested fixes and asked if they had python experience. They responded with a something along the lines of ya, we had the java guy do that. But the code stayed up there for a long time...